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ADS1198 Right Arm lead-off status only when LOFF_FLIP = 0x00.

Abhishek Ekhare
Genius 4655 points
Other Parts Discussed in Thread: ADS1198

Hello all,

I have configured the ADS1198 to acquire ECG.

Whenever i configure LOFF_FLIP (Address = 11h) value to 0xFF, i get lead-off status correctly for all leads except Right Arm lead.

And when i configure LOFF_FLIP=0x00, i get lead-off status for Right Arm lead but not other leads.

I am attaching my connection diagram.

Can anyone suggest how can i acquire leads-off status for all leads??

Thank you in advance.

Warm regards,

Abhishek.

  • 0
    TI__Mastermind 38745 points
    Hey Abhishek,

    When you make the LOFF register equal to 0xFF, you are setting the lead-off detection mode to pull-up/down detection mode. The pull-up/down resistors on the channel are not shown in your schematic, so I can't tell what is happening to the RA lead when the lead comes off in that scenario. Can you attach that part of the schematic? When you set the LOFF register equal to 0x00, you are clearing the FLEAD_OFF bits, which is an invalid configuration if you want to do lead-off detection. To do DC lead-off detection, set both of those bits. What are you writing to the LOFF_SENSP and LOFF_SENSN registers?

    Regards,
    Brian Pisani
  • 0 in reply to Brian Pisani
    Genius 4655 points

    Hello Brian,

    Thank you for replying.

    I am extremely sorry, actually i meant LOFF_FLIP register and not LOFF register.

    I regret my mistake.

    I will edit my post accordingly.

    I am attaching the pull-up/down resistor schematic part and values of CONFIG registers.

    Sorry again!!

    Abhishek.

  • 0 in reply to Abhishek Ekhare
    TI__Mastermind 38745 points
    Hi Abhishek,

    I provided an answer in your other thread so I will mark this one as closed.

    Brian Pisani